Magiana is the latest legendary Pokémon joining the (very large) pocket monster roster. Serebii has images of the CoroCoro reveal here.
I love how quick people are to assume it’s a legendary Pokemon.
Remember when Lucario was the first Gen IV Pokemon revealed and everyone thought it was a legendary?
Remember when Zoroark was the first Gen V Pokemon revealed and everyone thought it was a legendary?
It would be a safer guess to assume it’s the second stage in a two stage evolution.
And not a legendary.